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Sepia Braggi
''Sepia braggi,'' the slender cuttlefish, is a species of cuttlefish native to the Indo-Pacific Ocean. It has been found in coastal waters of southern Australia. This species was first collected in South Australia by its namesake, William Lawrence Bragg. ''Sepia braggi'' was then described by Sir Joseph Cooke Verco in 1907.''Sepia braggi'' is part of the subgenus ''Doratosepion'' which contains to 41 species of cuttlefish in total. Description ''Sepia braggi'' is a relatively small species of cuttlefish. Females of the species are larger than males and they grow to a mantle length of 80 mm and 49 mm, respectively. The mantle elongates to 3 times longer than it is wide. The mantle is cigar-shaped and triangular towards the anterior end. Narrow fins extend along the lateral margin of the mantle and widen along the posterior. The head is short and narrower than the mantle. The cuttlebone tends to have a similar length to the mantle. The common name of ''S. braggi'' or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Verco
Sir Joseph Cooke Verco (1 August 1851 – 26 July 1933) was an Australian physician and conchologist. Early years Verco, born at Fullarton, South Australia, was a son of James Crabb Verco. Both his parents came from Cornwall, UK. He was educated at the J. L. Young's Adelaide Educational Institution, and after spending a year in the South Australian Railways, intending to become a civil engineer, he decided to take up medicine. As he wished to matriculate at the University of London, he found it necessary to do more work in classics and spent a year at St Peter's College, Adelaide for this purpose. At that school he won the Young exhibition, awarded to the best scholar of the year, and then went to London at the beginning of 1870. He obtained his M.R.C.S. in 1874; M.B. in 1875, with scholarship and the gold medals for forensic medicine and medicine; L.R.C.P. in 1875; B.S., with scholarship and gold medal; M.D.; and F.R.C.S. – all in London in 1876. Verco was one of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Demersal Zone
The demersal zone is the part of the sea or ocean (or deep lake) consisting of the part of the water column near to (and significantly affected by) the seabed and the benthos. The demersal zone is just above the benthic zone and forms a layer of the larger profundal zone. Being just above the ocean floor, the demersal zone is variable in depth and can be part of the photic zone where light can penetrate, and photosynthetic organisms grow, or the aphotic zone, which begins between depths of roughly and extends to the ocean depths, where no light penetrates. Fish The distinction between demersal species of fish and pelagic species is not always clear cut. The Atlantic cod (''Gadus morhua'') is a typical demersal fish, but can also be found in the open water column, and the Atlantic herring (''Clupea harengus'') is predominantly a pelagic species but forms large aggregations near the seabed when it spawns on banks of gravel. Two types of fish inhabit the demersal zone: those t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bycatch
Bycatch (or by-catch), in the fishing industry, is a fish or other marine species that is caught unintentionally while fishing for specific species or sizes of wildlife. Bycatch is either the wrong species, the wrong sex, or is undersized or juveniles of the target species. The term "bycatch" is also sometimes used for untargeted catch in other forms of animal harvesting or collecting. Non- marine species (freshwater fish not saltwater fish) that are caught (either intentionally or unintentionally) but regarded as generally "undesirable" are referred to as "rough fish" (mainly US) and " coarse fish" (mainly UK). In 1997, the Organisation for Economic Co-operation and Development (OECD) defined bycatch as "total fishing mortality, excluding that accounted directly by the retained catch of target species". Bycatch contributes to fishery decline and is a mechanism of overfishing for unintentional catch. The average annual bycatch rate of pinnipeds and cetaceans in the US from 199 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepia Novaehollandiae
''Sepia novaehollandiae'' is a species of cuttlefish native to the southern Indo-Pacific. Its natural range stretches from Shellharbour, New South Wales () to North West Shelf in Western Australia (). It lives at depths of between 15 and 348 m.Reid, A., P. Jereb, & C.F.E. Roper 2005. Family Sepiidae. ''In:'' P. Jereb & C.F.E. Roper, eds. ''Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae)''. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 57–152. Description The type specimen was collected off Kangaroo Island, South Australia (). It is deposited at the Muséum National d'Histoire Naturelle in Paris. The species was described by Hoyle in 1909. ''Sepia novaehollandiae'' is known to grow to a mantle length of 77 mm, but specimens from Spencer Gulf reach mantle lengths of around 125 m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepia Apama
Giant cuttlefish also known as the Australian giant cuttlefish (scientific name ''Sepia apama''), is the world's largest cuttlefish species, growing to in mantle length and up to in total length (total length meaning the whole length of the body including outstretched tentacles). They can be over in weight. Using cells known as chromatophores, the cuttlefish can put on spectacular displays, changing color in an instant. The giant cuttlefish is native to temperate and subtropical waters of Australia, from Brisbane in Queensland to Shark Bay in Western Australia and Tasmania to the south. It occurs on rocky reefs, seagrass beds, and sand and mud seafloor to a depth of . In 2009 the species was listed at Near Threatened on the IUCN Red List of Threatened Species due to an observed declining trend at that time. Lifecycle and reproduction Giant cuttlefish live 1–2 years. Breeding takes place with the onset of the southern winter. Males abandon their normal cryptic coloring an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fishing Trawler
A fishing trawler is a commercial fishing vessel designed to operate Trawling, fishing trawls. Trawling is a method of fishing that involves actively dragging or pulling a trawl through the water behind one or more trawlers. Trawls are fishing nets that are pulled along the bottom of the sea or in midwater at a specified depth. A trawler may also operate two or more trawl nets simultaneously (double-rig and multi-rig). There are many variants of trawling gear. They vary according to local traditions, bottom conditions, and how large and powerful the trawling boats are. A trawling boat can be a small open boat with only 30 horsepower (22 kW) or a large factory ship with 10,000 horsepower (7457 kW). Trawl variants include beam trawls, large-opening midwater trawls, and large bottom trawls, such as "rock hoppers" that are rigged with heavy rubber wheels that let the net crawl over rocky bottom. History During the 17th century, the British developed the Dogge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spencer Gulf
The Spencer Gulf is the westernmost and larger of two large inlets (the other being Gulf St Vincent) on the southern coast of Australia, in the state of South Australia, facing the Great Australian Bight. It spans from the Cape Catastrophe and Eyre Peninsula in the west to Cape Spencer and Yorke Peninsula in the east. The largest towns on the gulf are Port Lincoln, Whyalla, Port Pirie, and Port Augusta. Smaller towns on the gulf include Tumby Bay, Port Neill, Arno Bay, Cowell, Port Germein, Port Broughton, Wallaroo, Port Hughes, Port Victoria, Port Rickaby, Point Turton, and Corny Point. History The first recorded exploration of the gulf was that of Matthew Flinders in February 1802. Flinders navigated inland from the present location of Port Augusta to within of the termination of the water body. The gulf was named ''Spencer's Gulph'' by Flinders on 20 March 1802, after George John Spencer, the 2nd Earl Spencer. The Baudin expedition visited the gulf after Flind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepia Cottoni
''Sepia cottoni'' is a species of cuttlefish native to the southeastern Indian Ocean, specifically from northwest of Broome (17°31' S) to Armstrong Point, Rottnest Island (32°0' S). It lives at a depth of between 83 and 183 m.Reid, A., P. Jereb, & C.F.E. Roper 2005. Family Sepiidae. ''In:'' P. Jereb & C.F.E. Roper, eds. ''Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae)''. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 57–152. ''Sepia cottoni'' grows to a mantle length of 55 mm. The type specimen was collected west of Lancelin, Australia (). It is deposited at the Western Australian Museum in Perth Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth most populous city in Australia and Oceania, with a populati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allopatric Speciation
Allopatric speciation () – also referred to as geographic speciation, vicariant speciation, or its earlier name the dumbbell model – is a mode of speciation that occurs when biological populations become geographically isolated from each other to an extent that prevents or interferes with gene flow. Various geographic changes can arise such as the movement of continents, and the formation of mountains, islands, bodies of water, or glaciers. Human activity such as agriculture or developments can also change the distribution of species populations. These factors can substantially alter a region's geography, resulting in the separation of a species population into isolated subpopulations. The vicariant populations then undergo genetic changes as they become subjected to different selective pressures, experience genetic drift, and accumulate different mutations in the separated populations' gene pools. The barriers prevent the exchange of genetic information betwe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepia Vercoi
''Sepia vercoi'' is a species of cuttlefish native to the southeastern Indian Ocean, specifically the waters off Western Australia ( to ). It lives at depths of 76 to 201 m.Reid, A., P. Jereb, & C.F.E. Roper 2005. Family Sepiidae. ''In:'' P. Jereb & C.F.E. Roper, eds. ''Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae)''. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 57–152. Both sexes of ''S. vercoi'' grow to 46 mm in mantle length. The type specimen was collected west of Shark Bay, Western Australia (). It is deposited at the Western Australian Museum in Perth Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth most populous city in Australia and Oceania, with a population of 2.1 million (80% of the state) living in Greater ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepia Rhoda
''Sepia rhoda'' is a species of cuttlefish native to the Indo-Pacific, specifically from the Arafura Sea () to the North West Shelf (), both off Australia. It lives at depths of between 64 and 184 m.Reid, A., P. Jereb, & C.F.E. Roper 2005. Family Sepiidae. ''In:'' P. Jereb & C.F.E. Roper, eds. ''Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae)''. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 57–152. Females grow to 58 mm in mantle (mollusc), mantle length (ML). Males are slightly larger, reaching 61 mm ML. The type specimen was collected off Point Cloates in Western Australia (). It is deposited at the Australian Museum in Sydney. References External links Cuttlefish Molluscs described in 1954 Taxa named by Tom Iredale {{cuttlefish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepia Limata
''Sepia limata'' is a species of cuttlefish native to the southwestern Pacific Ocean, specifically southern Queensland to New South Wales, Australia ( to ). It lives at depths of between .Reid, A., P. Jereb, & C.F.E. Roper 2005. Family Sepiidae. ''In:'' P. Jereb & C.F.E. Roper, eds. ''Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae)''. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 57–152. Females are slightly larger than males. They grow to a mantle length of and , respectively. The type specimen was collected off Manly Beach, New South Wales (). It is deposited at the Australian Museum in Sydney Sydney ( ) is the capital city of the state of New South Wales, and the most populous city in both Australia and Oceania. Located on Australia's east coast, the metropolis surrounds Sydn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
